Single player, by 
A large pack usually calls for a large review, but there isn’t anything especially interesting to say of this pack unfortunately. It’s not that it’s bad – it isn’t – but it’s jut a bit …generic. All levels are more or less the same: large, sparse eyecandy, LOTS of enemies, little challenge beyond avoiding the enemies.
Which isn’t especially hard either with Spaz’s karate kick, but many enemies respawn quickly and there are some parts where you have to avoid warps or time your jumps well. As such it happens that you’ve just cleared a platform and are then hurt or killed by an army of baddies spawning right on top of you. Not exactly ideal, but on the other hand they’re mostly placed on flat platforms with lots of space above them so in many cases the best solution is to simply jump over them.
As said, there’s nothing wrong with these levels – they’re just not very interesting to play. Some more variety would’ve done wonders – different tilesets, more puzzles, enemies placed in such a way that they’re harder to avoid. And maybe don’t set the “next level” setting of each level to “Data.j2d” ;)