Very good concept! I liked the idea of trading time for ressources (we went the same path =p), it's an interesting take on the theme! The art and music are really good, they setup the atsomphere greatly ^^.
The controls are weird, and I got stuck in the "tuning" menu several times., and "Z" to attack is really weird. The camera could also have a bit of work: in the second level, for example, we don't see what's below us, so we must take a leap of faith in the spikes.
Overall a great concept that need a little bit of refining, but still a good entry, congratulations =)!