I really enjoyed every aspect of this game, from graphics to music to gameplay! That said, I do have a few quibbles:
- The cutscenes loop every three levels and appear to be unskippable. They get a bit boring to watch.
- Dying takes away your special weapon and resets your power bar. In later levels, where huge swarms of enemies are the norm, this is a recipe for almost insurmountable failure--you have to make a dash for the mimic and hope you can take them out before you get overwhelmed or lose a letter somewhere.
- A letter goes flying when the enemy carrying it dies, which is neat, but it can potentially bump into another enemy (annoying) or a pit (kinda unfair). In later levels, where losing even one letter means failure, this feels really bad.
Again, the game is really enjoyable to play! I made it to Delivery 21 with 20,881,600 points.