This game was really fun! I honestly don't have much to criticize.
The art and transitions made the feel of the game very smooth.
I loved the gameplay, too. It's simple yet a lot of fun. You almost instantly get the hang of the game.
For the shop, at first, it was a bit confusing to me, but it didn't take long for me to understand how it worked and the abilities of the potions. The help menu was highly appreciated!
The only suggestion I have would be to add some sound effects and music to make the game feel more alive, but as you said, you didn't have much time left, so it's understandable.
Overall, this game was great! It had simple and fun gameplay, interesting abilities from the shop, and great art combined with sleek transitions!