This is a good 1st game!
I had fun playing through the game, it starts simple and knows when to change to another mechanic, from just eating to minigames, I think that’s good or not just base the whole game on eating haha. Also slowly building the little story of the game is nice, learning about the rules and then in the last part applying those is good because it gives more meaning to them.
I think the only thing could be better is, the music starts quiet and 2 levels later, it sounds more high, so trying to level the volume to be the same in the game would be a nice touch. Outside that, I can’t think of something to give feedback, or maybe have a secret path just for the sake of it and give the player something special. Some areas felt like they were hiding something for how big they were. :)
Also I like the last part because it gives you snail facts and if you lose, you can try again which is good, and the tension can feel a little bit for how it was slowly built from the start, like finally seeing the big snail in front of you challenging you was fun.
The sprites are good and the songs were a nice pick, it really fit the mood, the last part it feels a bit like Ace Attorney or it gives me a similar feeling hahaha. Everything feels nice together and makes the game nice to play. And the chess part was good, I like that, great that the hint was there haha.
Keep doing games, you did a great 1st game ^_^