I've been playing this over the weekend, and it's pretty cool. As an unexpected bonus, it comes with a 2nd disc in the case, which is Implode Remastered.
Here's the four games and my initial thoughts:
VAX - fun little "flip the switch and avoid enemies" type of game. Not a ton of depth (yet?) but it's fun and only 50 stages so it shouldn't get tedious.
Wave of Thunder - Addictive! It reminds me a bit of Hydra but without shooting.
Zars Ultion - Is yars revenge this slow and frustrating or do I just suck?
Slope Dope - This one is also addictive. My thumb hurts trying to dodge everything on my way downhill.