This one is my first public release of my games. I say it's pretty addicting. It's quite difficult too. It has "enter code" system, so you can play some levels and finish later. But in order to submit your score you must play all levels.
There will appear more collectables as you pass through the levels.
Arrow keys to move, Enter/Space to start new level.
Collect power-ups, avoid spikes, collect all the coins, jump to the new level throught the portal.
The final level is the best. ;)