Teaching is so stressful. Felt like I was back at school. I was about to call it impossible but I noticed you mentioning the whistle, 2 uses, right sounds powerful then. Indeed. Bought me quality time.
Quite the experience. The whistle sound was so fitting, like purpose made. I think you borrowed the sprites and classroom from somewhere, possibly LimeZu related but it must be paywalled because I can't find it. Don't know how much you drew yourself but I struggled reading some of the numbers, 8 vs 9 especially maybe also 6 vs 8. I think the lines could have been fainter.