I would say that it starts out kind of relaxed but the pace ramps up to semi-frantic, but not super-frantic (less than YMBAB or bejeweled blitz). It is easier to recover from a mistake than YMBAB. Very attractive, great music, etc. I am up to day 66/tower 15. I like it, it's fun, though I do have concerns about the longevity. There are only a few new wrinkles that have been introduced since the beginning. Every wave (except the bosses) is more or less the same thing. Unles im missing something, there's no real need to approach a given level with a different strategy than you would use on any other. The core gameplay is very solid, there's just not that much variety. The upgrades are nice to have, but there's not that much choice to be had aside from the order you upgrade things. I kind of wish individual levels were more distinct and you had to pick from the available upgrades to change your approach to that level, experiment with tactics, etc. so far, much like YMBAB, there isn't much feeling of progression aside from getting past the next level because enemies scale with you and the upgrades I've seen are all passive effects. Easy recommend for match-3 lovers that don't object to the real-time too strongly or people that like lane-defense games with at least a passing interest in match-3.