The game isn't in fact a Mario clone, however at first glance it looks like another walk-right-avoid-monsters-and- collect-colourful-objects game. The game isn't "childish" at all, further levels are really hard and jumping tricks require very good skill.
After spending some time with this game I think it's one of the best freeware platformers I've ever played.
Glaxium is an OpenGL-based third person perspective space shooter.
Gameplay consists of flying your ship over the moon-like (at least Earth is visible in the background) rocky path, shooting enemy waves, avoiding bombs and destroying boulders containing bonuses. Glaxium has no options, no story and unknown length, so there's not much more to write about it.