I'll jolt down a few things I've noticed and that seemed to be shared with some other people playtesting:
Gameplay:
GL - Feels excellent.
Mortar - Could use a boost in range. Also, seems to be a bit too weak. Its max damage is alright, but it could do with higher damage within it's radius.
Blaster -Awesome indoors, so far not worth it anywhere else. Not sure about this one.
Plasma - Great fun, not very effective. Goes random very easily.
Skybolt - I heard everyone say it could use a damage boost. I didn't use it, because the sound is just too annoying to deal with atm.
Esthetics:
Mortar - Like mentioned, please make the effect less 'puff of smoke' and more 'KABOOM'.
Blaster - Looks great, sounds fantastically quirky.
Plasma - The projectiles and their impacts are huge, making it look very spammy. Smaller projectiles and impacts please.
Skybolt - The sound, oh god the sound. It's also still very difficult to gauge where the projectile head is, making it very difficult to aim properly.