Not bad, liked it. 3/5. Would have 4/5 if you added gold/silver/bronze medals (or similar) for how well you did on a level instead of an ubiquitous checkmark.
Really liked it a lot. Speed didn't bother me (i.e. there's no speed up button in StarCraft... you just have to wait).
The "achievements" you get through the game are pretty redundant. What's the point of an achievement system if the only achievements you can get are from beating levels? Would be nice if there were like "Beat X level in under 10 minutes" type achievements. That would give it more replay value.
Overall, love it, 5/5