Use left and right arrow to move, and up arrow to jump. You can swim in the water, and jump very high on the purple block. But be careful ! There are lava and spikes. (In fact, all red and gray objects kill you.) Press "i" to show/hide information (level number, score, and lives). Press "space" to respawn at the beginning of a level. It's sometimes required if Gobo is frozen, but this can be fixed most of the time by jumping. All the levels are possible, and it's possible to take all the dollars.
You're Gobo, and you're lost... Use the arrows to move. You can jump when you're on grass, and you can swim in the water. But be careful ! There are lava and spikes. All the source code and the pictures (except Gobo) are made by me. Thanks to "JamesOuO" and "Meow127" for their advice.