The theme is quite interesting and the level design is unique. Making the help screen more interactive to test out different powerups/characters would be a nice addition but I also think your first level generally answers most game play questions. The slider/bar for the remaining "hp"/ time left to play the level is certainly unique and works well with the visuals. One critique is that the powerups/ability for the second character could also have a bar/indicator of remaining flight time. The enemy design is interesting but taking "damage" from enemies, especially repeatedly, is not that clear. I like the option to pause.