Been working on this one for a while and I'm eager to share it. UFO 50 is a collection of 50 retro-style games, and I decided to write a blog post reviewing every single one. Enjoy!
I'm trying to cherry the game without reading a guide, and I can't find any secrets except a couple warps that don't end up leading me anywhere new. In fact, one simply goes backwards one level.
So if there are more actions than the ones I know, my ignorance is almost certainly holding me back.
You can backflip in mid-air which is useful to go a little higher or cancel the direction you're moving in. I don't remember the exact control for it, but I think it was double tapping after jumping.