Bugs so far:
* Cart doesn't respond at all at times.
* Doesn't cancel out of tricks sometimes
* After continuing a saved game, some tricks don't work. At all. Ever.
The fact that you can loose upgrades by failing to land correctly (which one of the above guarantees) doesn't make it any better.
In case of a sequel, a feature to display a"ghostline" of a selected previous try would be highly appreciated. As is, some of the later levels are basically nothing more than an incredibly frustrating pixelhunt.