Very charming game! Really like the look of the game, very pleasant color palette.
I do feel like - and this might just be me - that the difficulty of the second level is already fairly high - took me a try at the final jump to realize I had to use the enemy, and quite a few more to get the enemy to be colored at just the right spot.
I also struggled a decent amount with the control of the numbers - it didn't seem like the numpad worked, so I used the numbers at the top row of the keyboard, meaning I had to do both movement and the numbers with one hand.
I do think the idea of using the numbers is a cool concept, I'm assuming it was inspired by those color-by-number coloring pages? The design of Kat is also adorable - the game just has a cutesy aesthetic to it in general, which is very nice!