That's pretty funny! The player character reminds me of the game franchise "Worms". The falling over was a bit annoying at times. Got to the win twice by falling down at the right side. Never found the boss though, or found a way to open/enter the big door.
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You are right ! it kinda does look like worms :p
The door opens only when you kill all the enemies 4 in total. It says that on the information card at the start the one you can toggle with the letter "i". "Kill all the enemies then head to the door". The win thing is intentional, I thought it would be funny if you went even when the player dies lol sadly it just confused more people lol.