It was ok, but there was no motivation other than challenge.
No upgrades, nothing.
I beat every level on easy and just. quit.
I found this game to be fairly enjoyable. What I didn't like about it was how it was a bit hard to understand what the crystals did. I do, however, think I have it mostly figured out by now. The red ones allow you to fire an automatic shot at an enemy, the blue ones make a shield, and the yellow ones make a shield that can also be used to attack. There wasn't a lot of detail, but it was still fine. There was certainly a lot of wide open space.
I liked that because it gave you a sense to go anywhere you wanted. The leeches look like pink, pulled teeth. The background isn't too bad either. There's certainly some good flashy colors here and I even like the description. The sounds are nice as well.
On the mission selection screen, there's an introduction button that gives a short explanation of the game. Red crystals fires a homing missile, blue makes you invincible against leeches and projectiles (not bosses), yellow makes you move faster. Every 10th crystal has a special effect. Red : launches projectiles in all directions, blue heals one heart, yellow slows down all enemies on the field.
Not bad, but medals don't work.
wow - I loved the game. I found it inspiring. A little heavy on the ads but I've played 40 minutes now and imagine I'll finish the game. Not something I usually do.