Making 2D platformer game

[ArtLock]

Hello Internet browsing humans that probably came to this forum thread section because you were bored and looking for a project to fill your time, then saw 2D platformer in a thread title and thought something like "well thats different, lets see what this idiot of a 12 year old is planning on failing at".
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So I'm a jack of all trades and have done a little bit of everything, this isn't my first time in game development, however this is my first time doing a 2D platformer and will also be a first time using some of the software I'll be using to make this game.

Since this will be my first go at a 2D platformer I'm just looking for a small simple game to make to start with so I can understand the software I'm using better. This is where you would come into play, I dont really have an idea for a game to make for this first go, so I want you're ideas, and feedback.

Somethings to understand before you jump in.

No, I will not pay you for your Ideas.

No, I'm not 12, I am over the age of 18 so I'm not just a random kid with unrealistic ideas, instead I'm a crazy adult with unrealistic ideas, there a difference..... probably?

This test game will be free to play and will not be sold for profit. Mainly because I expect it to be far from perfect and have bugs.

I'm Not asking for people to make this game for me, I plan on doing all the coding, graphics, animations, music and sfx myself. This doesn't mean i wont accept help with making these things though if you're qualified and feel like pitching in.​

Here's some Info on what software I'm using for this:
Game Maker Studio 2 (game making software)
Acid beats (Music making software)
Asprite (pixel art/ animation software)
Sound Forge Audio Studio (Audio editing software)
Along with other software I decided to obtain along the way.

So how do you get involved? Join my discord and lets talk and come up with ideas.
https://discord.gg/nWxzrRF​