general:
. it needs a crosshair to see where we are aiming at.
. hard to see which players is an ennemy or an ally.
. same for the summons.
. lobby timers are annoying.
. knockbacks and ragdolling would be a fun addition when some heavy hitting spells land.
. i like the bell boss. annoying but in a good way and original. perhaps boss monsters could have a health bar showing somewhere.
. numbers nearby hp and mana pool would be appreciated. especially when you want to quick cast but you don't have enough mana when the mana bar seems to be full.

gamemode:
. deathmatch mode is not fun. the issue is that the game abrupty finishes on a set timer with some random scoring. each player's score should at least show on one side of the screen.
even then, a true deathmatch with kill counts would be better. custom games should be able to decide for how long a game should run.
. survival felt a bit repetitive. it is just running around spamming spike walls and shroom heals. that may be because of the currently poor number of different monsters. some unique monsters could have a special attacks. (tike the bell boss had.)

spells:
. all spike walls spells are overkill. the rest feels very underwhelming. probably because their damage is so low.
. quick cast spells are tricky to balance. firstly because it use all mana at once which feels a bit too much. secondly because a spike wall quick cast means an insta kill.
. it is too easy to run around and spam protection spells. perhaps spells of countering elements should ignore shields.
. it would be cool to get info on how much mana a spell cost. right now it feels random.
. i miss a good meteor spell.
. the chosen element could iluminate a players staff with the color of the chosen element. so that a good player could see what element is going to be in use and eventually try to prepare a counter.
. summoning didn't felt good to use. running around and spamming moslty useless monsters felt meh to play and play against. ok for coop but boring for pvp. heal shroom is obviously usefull... tho perhaps a bit too much.

maps:
. current map pool is alright for testing but it definitively needs more maps.
one map i could suggest is a big platform with holes, pu in the sky. to make use of those pushing spells.
another one could be an island with water actually slowly drowning the mages.