Yeah, new enemy types are introduced at level 2, 5 and 10 but then after that it just scales proportional to the level. My thoughts were that you could probably get to level 10 in 10 minutes and have a full experience of the game.
good idea, I did the same with my game as you experience everything in 10 minutes but can decide to keep going
cool, i'll give it a play and a review. still 4 hours to go!