Pengu: Lost and Wanted DEMO You have something really good going here, I could see this being a full commercial release if you really put in the time with it.
That being said I a few small gripes with the game's controls.
First off, there doesn't seem to be any coyote time or jump buffer in place. They're really easy to include and can make your game feel a lot snappier, there's plenty of tutorials on how to implement them in GameMaker specifically.
Second, air movement feels weird, I'm not a fan of how the double jump halts your momentum, it feels very counterintuitive to the game's speedy design. I'd either make it so that it doesn't affect your momentum whatsoever or remove it and give the dive more vertical height.
As for personal suggestions that I think would be neat:
I'd like it if you could angle the dive, like if you hold up while diving you get more vertical height but less horizontal distance and downwards so you can get to the floor faster. The downwards one could also have some fun interactions with slopes, giving you a shit ton of speed.
I think the game could benefit from some sort of hidden collectibles similar to the star coins in the newer Mario games. (Maybe presents to go with the Christmas theme?). This would encourage players to explore the levels for more than just personal satisfaction.
I'd also like to see some sort of alternate color system in the game along with the hat idea that SmashKid suggested earlier. Pixelated Pope's "Retro Palette Swapper" is an amazing (and free!) premade shader for GameMaker that does exactly that, Pizza Tower uses the same shader for its alternate colors as well.
Lastly I think a ranking system similar to games like Sonic Adventure 2 or Pizza Tower would be really fun and could add a lot more replay value to the game.
Hope this helps, keep up the good work!
GIMMIKO DEMO 
Tankmas ADVENTure 2021 
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Kill Bowsette in a Blender 2 
