atm it's just a walmart gttod even the artstyle
add momentum, cause it's so weird when you rocket off the wall and then when you hit the ground, you still have normal walking speed.
and learn modeling, you can't take shortcuts with ugly design, it's your dream game!
also learn sound design, just like animations, sounds have a big impact on gameplay, for example you would play doom differently if the gun soundeffects werent that bassy.
(or if you don't want to I'm willing to help for free (I'm a hobby sound designer/music producer) cause I don't want to hear those gun soundeffects no more)
make the character reflect, that would look sick or you can make the floor reflective cause that would also look cool
and please for the love of god, get an original art style
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I mean you cant get an original art style, because there are thousands of games, and your bound to have the same with at least one, it called a demo, I know you want the game to be good, but he has to do things one at a time, when you say "you can't take shortcuts with ugly design, it's your dream game!" he has to make the basic controls first, and not focus on things like looks, he has to make sure the game feels good before looking good