I really love your game! I like the idea generelly and your design :).
I'm not a game developer so my input may be off no great use tbh.... I just miss some small things and thought hey maybe you like the idea too. :D
I love the idea of training and watch the outcome. But would you mind adding a little bit of "gacha game vibe?" The students just appear and there is no difference just easy, medium and hard.
Instead of the students just appearing with starting the game and randomly adding new ones I thought -> Hey it would be cool if I could search for new students myself. Maybe with differences like ranking from common to rare. So a player would have more influence in the game.
I hope you continue to update the game!!