Collect all coins in level 10
Visit any of the developer's pages
Win 5 levels in a row without dying
Win level 25 without killing enemies
Die 25 times in a row in a single level
Win a level with 1 hp left
Win Level 1
Win Level 5
Win Level 15
Win Level 30
Win Level 50
Win Level 75
Win Level 99
Win Level 100
Win Level 10