Really good games, especially first one. I am a frontend guy so visuals are the first thing that I notice :) Gameplay wise it was great, enjoyed different levels and the dialogs. Your art style is consistent so it works with the whole game. I want to give some comments on possible improvements:
1. Find and use different font. Its relatively small effort but can greatly improve the visual appearance
2. I mentioned it already for another game but to me it wasn't cool that upgrades appear immediately. I was so focused shooting the mushrooms that I accidentally picked up idk what several times. I'd like it to be an explicit decision, like separate button and maybe some indication that I can choose something
Mostly these are the main comments :) Overall there is room for growth at least from UI & polishing perspective but you already have the main key of success - Fun and/or addictive game. Prototype version is done (congratulations), next you can challenge yourself with appearance. Maybe you can exclusively make it an old school styled game. The sky and your imagination is the limit. Wish you good luck and to continue on your amazing progress!