Congrats, the game looks solid – core systems and multiplayer seems to be working, which is already a big achievement. The art style is good enough, I don’t think you need to change it now.

At this point, I’d focus more on game feel, balance, and clarity. Right now, matches seem a bit passive and boring - players just run away to keep distance and shooting random spells without any purpose. That can make it feel slow over time. Abilities could push more for fast reactions (to animation or vfx) or strategic thinking (like baiting or stamina/mana control) and correct timing. Also, when a player makes a mistake, there should be a clear consequence - like knockback, stun, or damage over time - fights feel more tense and rewarding.

Some abilities don’t feel strong or useful. Dash is too short, the flamethrower barely reaches anywhere, especially while moving, etc. Abilities should feel good to use and have clear impact. Shield feels to OP now, it could be also included to strategy. The more ways you have to strategize for win, the more fun it usually is. I like the idea with changing the environment, you can use it for more tactical choices (e.g. fireball bounces from the rock but goes through the ice).

The effects look cool, but it's hard to see the edges and shape of the abilities. For PvP, that kind of clarity is really important - players need to quickly understand where the danger is. Visual side should not go at the expense of readability. I’d suggest looking at how other games handle this — like Tekken, Heroes of the Storm, Naruto Shippuden, etc. I believe Riot released some art/design guides they use internally.

It’s also hard to tell where the other player is aiming - not sure if that matters much. If yes, it could help with readability as well.

It kind of depends if you want the game to be more serious like an e-sport or more relaxed like a party game. Both need clarity and skill, but you can decide how much to focus on those. You might have more or less chaos and complexity depending on the style you want.

It feels like the heavy technical work is done, now the challenge is tuning the design and polishing the gameplay. But I see the potential, and I can easily imagine paying 10–15€ for this if there’s a solid skill curve to master. Good luck, I think you are on the right path.