Visuals: I like it, animation is very cool. Character is cute, also it's a nice touch allowing color customization. Though you could probably include a basic mode for it so you only have main and one or two sub colors to change instead of 8 or however many there was.
Audio: Sounds good to me.
Movement: Keybinds were fine, though I kept forgetting what block was. Movement is fun to execute, especially slides since it's granular instead of a straight line. Homing onto an enemy from the air is fun, though at times it felt difficult to judge how far the homing would go and sometimes I would stop shy of them and get clobbered.
Arena: 2hard4me, though I don't really play these combo action games. Kept getting one shot by the big dudes or accidently eating a bomb in T1. Being one shot is very punishing for the first challenge, also I couldn't find rockets in the default layout so I have no idea how to kill the flying enemies dropping bombs. The arrows feel a little vague to rely on, I mostly just spun around like a mad man and scanned for enemies walking into the arena. I also did that because I felt paranoid that an enemy would sneak up on me otherwise. Consider adding a radar system so it's more explicit?
Garage: Presentation here looks great. Looks like it has a deep system, but from the beginning not much seems to be available to customize. I noticed that for the module abilities I have to scan over all the items in the different tabs if I were to look for a module for only one body part. Maybe add another set of tabs of 'sort modules by their abilities for a given body part' or something to make it easier?
Seems like you're making good progress on this game.