Backlog

• improve collision detection (check two time-step positions at once)
• fix toBeDestroyed/splice stuff
• block disable jump (possible double jump for block)
• viewport shift (horizontal)
• artificial intelligence sequences
• level transition (needs work)
• weird lines in Mozilla (but not in Safari).

Characters

• block
• man
• boat
• frog
• plane
• jellyfish
• clock
• flame