This is the kind of simple but not crude game that I like very much! The atmosphere is very peaceful and the levels are also very interesting! I knocked over the snail.
I think the existing problems are all details:
1. The health of the monsters can be set to 1 or 2 attacks, because your battle is not complicated, and high health is just repeated operations
2. Reduce the invincibility time after the player is injured
3. Small bug, when passing the level, the player can continue to attack
4. It is recommended that the bricks that can be broken can not only be used as obstacles, but you can also guide the players use them to make a ladder to jump to a high place by themselves. If all are broken, they can't reach it. This is generally used as a condition for opening a hidden road. Don't use this design to block the player's normal clearance path, but as a surprise.