First impressions:
Fun! This would be something I'd download/play on a tablet because it reminds me of slither.io. It played smoothly on my desktop and there is clearly a lot of social aspects built into the game. I played multiple rounds once I figured out the goal/objective.
Bugs:
I was running it in Firefox and got this security warning, you may want to investigate.
Challenges:
I would have benefited from a quick explainer telling me if I should be expecting slither.io or Mario Kart's Balloon Battle mode. I interpreted it being a combination of the two through trial and error (I don't know if that was the correct takeaway or not). The bottom right notepad explaining drift was very useful, seeing additional notes explaining how to use the weapons, what/if there is a benefit from picking up the orbs, and an explainer on the hearts/HP system in that area would have helped me. It took me a bit to notice my hearts, because they were the same color/location of sphere count.
Ideas for future development:
1. Terrain elevation, hills, valleys and dips. Would allow for a king of the hill mode, ambush opportunities, and tactical defensive maneuvers when opponent attacks are straight lines (imma firing muh lazer for example, dip into a valley and the beam goes over top of you).
2. User uploaded characters, allow a player to submit a pixel art picture to use as their character's face. Could give you free source of labor/art assets so you don't need to draw everything yourself.
3. Weapon familiarization. I'd like to know what other weapons are available quickly. Mario Kart shows the weapon you were going to get by quickly cycling through their icons before landing on one. You could leverage a similar approach to quickly show a player "oh, there are 10+ weapons I can get because I just quickly watched them all cycle by while getting my weapon assigned to me".
4. Missiles. If you implement the terrain system, you could also introduce weapons that specifically work with changes in height and elevation, like a missile that is fired at an 45 degree angle and hunts a player before coming back down at the same angle. If you need it to be a meme, make it a spring onion/leek.
Please note that my future development feedback is heavily biased towards a Wulfram 2, I've been playing recently. https://www.youtube.com/results?search_query=wulfram