Very cool game! It would be a bit nicer to find health to pick up instead of changing size. Maybe try to add a health bar and some visuals for the growth and shrink, adds a lot of polish to a game. Other than that, good job!
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If you want to implement changes after the jam, absolutely go for it, there are a lot of resources on youtube that can help out. Though honestly, I find game jams to be a great learning experience to implement feedback on your next game. Take all of your comments, and think about how you can make an even better game next time, and eventually, you will get quicker and make more polished games!