what other greats games you recommend ?
I don't mind the production level is abit lower
Tales from Space Mutant Blobs Attacks is considered one of the best <$10 dollar games on the system.
Guacamelee for your Metroidvania mixed with a fighting game and properly challenging platforming.
Monsters Ultimate HD for what is supposed to be one of the best Tower Defense experiences out there.
Titan Attacks if you like the old shoot enemies at top of screen, you're at the bottom experience.
Pixeljunk Shooter Ultimate for something a bit different. It's a puzzle Shmup.
If you want a real challenge get Spelunky. Be warned, 1 wrong step without carrying something and you'll get shot by an arrow into a spider and then knocked into a spike pit and lose your great run. One of the gold standard combos is the Jetpack Shotgun combo which makes you basically able to beat the game fairly quickly.
Then there's like Hell runs where you kill the shopkeepers which ramps up the games urgency and danger a good amount, for pros only. Really crazy game. At first you gotta play it slow otherwise you'll never get out of the mines, and remember always be carrying something. You will never win if you can't defuse traps.
You kinda have to keep learning, and failing, and dying, and memorizing what everything does, and learning what's important for your gameplay style, and be careful not to buy a pair of springs instead of bombs, and then launch yourself into a spike roof. For example the shotgun (when you jump) will kick you up in the air, so you can save a rope by using a shotgun blast properly.