Will add more suggestions as I think of them.
How about making it so that “clickable” things have a “shine” effect? Something to indicate that it’s something you can click. Or you can do something like this:
Some type of way to tell that it’s a clickable thing, especially for the results screen where the factors do not have any telltale sign that they’re clickable.
An Alternative is to make the cursor change colour when it’s something clickable.
This mainly benefit new players but this should include casuals as well.
As part of in-game tips option. Whenever a new item appears for the first time, a pop-up will appear explaining what is it and its uses (keys, gifts, powerups). The player can either click “Ok” or press Esc to continue. It highlights what item is mentioned as well. This also includes whenever a player uses a superweapon/consumable for the very first time.
The in-game ſtuff is all pretty ſelf-explanatory; if the game requires a tutoriäl, it’s not been deſigned properly.
I’ve been thinking about tips for a mission, like ‘This mission only consist bosses’ for boss rushes, example, and an information button like ‘This mission is hard and has 20 waves’ for example
How about adding a “Weapon Test” feature for players to try out weapons that are in the store?
Give the “Weapon Test” the “Classic Invasion” wave from Chicken Invaders 3 with “Dummy Chickens”, (make them look like straw or ragdoll versions of chickens. They also will not drop anything, and do not give score either) along with being able to toggle firepower for weapons to see how it powerful it can potentially get.
Perhaps the “Weapon Test” can have a special background? To make it look more like a testing chamber.
Something like this:
If possible, make the dummy health changeable. (Up to 10,000 health)
This will also allow for easier weapon damage testing for future tweaks. (to see if they need a nerf or buff)
(This may have already been suggested. Please send the link here if it already is, thanks)
A tutorial re-work is desperately needed, will address it as soon as weapons are in a reasonable state.
Well, the assumption is that you’d first play the game, collect the weapon randomly, decide that you like it, and then buy it so you can start missions with it (so you’d already know what it does).
I see the point of a weapon test range, but it creates a lot of special-case code for being simply a convenience feature.
I think items in shop also should be tier capped, so newer players don’t buy something unnecessary for their early journey.
Tutorial level or weapon test range (and such) could be located in Hero Academy.
Here’s a suggestion for a new skill. (To take up the lowest spot instead of Tourist, so tourist will take rookie’s spot on the meter)
Relaxed
Costs 20 keys
Description: Who needs another hero anyway?
Damage: +50%
Scoring -75%
Power-up Spawn Rate: +50%
Greatly Reduced Key Spawn Rate
As for Universal Grandmaster… I have an alternative.
Universal Grandmaster:
Even better than the Authentic Hero! Or you’re just suicidal.
Scoring: +300%
+50% Mission Difficulty
Projectile Speed +50%
Power-up spawn rate -20% (or Damage -10/20%)
Substantially Improved Key Spawn Rate
No wave zones marked
Calling the difficulty casual is kind of not going to go down well with some people. Especially because @Enhawk helpfully outlined that casuals are not necessarily bad, or incapable of being competetive:
Eh, I meant casual in the sense of “relaxed”
How about I rename it to “Relaxed”?
Or you could rename it to ſomething more chicken invaders-y, like “Touriſt”.
But that name already exists.
How about you give me the name 
Pizza Deliverer…?
Do we really need an eaſiër difficulty?
Is the current Rookie any harder than hiſtoric Rookie?
If not, I think that having juſt one difficulty eaſiër ſhould ſuffice.
How about replacing ci4’s metal suits to ci5 metal suits by not making them bounce off while fighting henterprise?
I think IA ſaid that theſe were really hard to ſwap out programmatically. That’s why they’re always chickens, even at harder difficulties.
Well, if a harder difficulty is not going to become a thing, at least an easier one can help take up a spot.
I wouldn’t mind if this difficulty got added because it could work like a “story mode” available in Celeste or in “Full Metal Furies”, but… we don’t have any singleplayer content here in CIU. So what’s the point of adding it now? Would it be really fun to remove any challenge from the game? Right now we only have tourist difficulty if someone really has hard time with default rookie difficulty. If someone can’t play even on tourist… then better find another game or improve yourself.
Well, nothing wrong with an even easier difficulty. Besides, both sides have their own issues:
If it’s too easy, people complain.
If it’s too hard, people complain too.
But…
If it’s normal, people complain that it’s too bland.
Soooooo, what the heck am I supposed to suggest? 
I mean, They’re coloured white and all but they do appear in rainbows like “Chicken Fractals” etc
