oh I forgot to tell you Herostratos that the monk boss (cage) fight is not the last one. But from there it's mostly boss fights. You have to fight the necromancer several times.
Completed the game in my 1st try. It's too easy and maybe a little too short. Flying is a little annoying but otherwise a good game. I give it 4/5. Btw the monk boss is very easy just use power attack on him. Don't cast any spells.
Completed lvl 30 in my 2nd try. This is a very fun game but I think you should only get the badge if you actually beat the last lvl. (you get it just by making it to lvl 30)
I got 680 seconds. And the timer works just fine so stop complaining. For those of you who don't know: 1 minute = 60 seconds, so to get the hard badge you have to survive for 10 minutes :)