Glad you liked it! We had a bit of experience with bigger teams from previous jams and things fell pretty well into place.
The difficulty ended up a bit too much on the easy side, yes. That was a bit of an over-correction from how it was at the original deadline. There was also supposed to be a hard and endless mode, but there was a show stopping bug regarding that so we didn't end up making those available in the final version.
Balancing is definitely what I'd tweak a bit more given another hour or so of dev time.