Very nice game, only complaint is that the sensitivity is really high, and I could be wrong but it seems like the sensitivity is also constant speed, I think you should make it where the initial movement of mouse is slow then it accelerates you can use hooke law springs for this
The character customization should be a color wheel or color square instead of just inputting RGB values, also be careful about this since players can choose skin colors for all body parts which isn’t allowed on roblox (also I believe the char customization doesn’t work since selecting limbs doesn’t change anything)
The shop GUI a bit jarring to look at, the titles like “Kill Effects” are in grey colors which kinda blends in with everything I think using higher contrast colors would be better to make it obvious that its a title text
Also If possible trying to blur the background a bit would be nice so the GUI and the background has more contrast making the text easier to read
Overall good game just have a few nit-picky things 