I had a great deal of fun playing this game. 2D pixel art kinda gave me Mega Man vibes. 1st and 2nd boss wasn't so hard but 3rd one was hard af even in normal mode. You need to change the right loadout for every boss. It's a great use of the theme btw. But i find some of the modules a bit redundant in the current state of the game. Like dash and shield. I don't know maybe some players devise tactics for those modules or you'll add some bosses to the game in the future which will require them.
Controls are tight. I noticed that the harder you press space, the higher your character jumps. Like the controls too.
Boss design is artistically very good. In terms of combat, they all have different attack patterns which are unique to them. You figure out their patterns like in every video game boss fight but some games in this game jam have boss phases which adds more depth and variety to the combat. I broke one star on the boss design criteria for that. To all other criteria i gave 5/5.
I think it's a very solid game, i really liked it. Nicely done!