itch.io

Okay, I think it will be better to try and give some direction in which to go in my opinion, rather than just blast the game with pointing out the negatives, so I'll try that.
1. Some kind of tutorial would be 100% necessary, while it is quite obvious what's going on pretty quick, it still doesn't really show any goals other than "points".
2. Much better collision should also be implemented, as at my first playthrough blue mage just fell through the floor
3. Sound effects and music make the games better with few simple clicks, it's a sin to not include them, you should check out how much better the game with even simple sound effects is. I mostly use freesound(dot)com for creative commons 0 sounds to use in my jam entries, but you can look around for different sites.
4. Skills that you use should give player a feedback of what they did or are supposed to do, I personally had no idea what my skills did. With the "rewind back to other mage position" - if it's supposed to rewind, give it a rewind animation, not just teleport it to the other mage, with the "F" if I remember correctly I had 0 idea what the skill did. In giving feedback for the player you can use things that the player should already be familiar with, for example everyone expects spikes or fire to deal damage.
5. Enemies should also provide feedback other than just the HP of the mage dropping down.
6. Level design is very important in a game like this, so consider making it more clear with adding different colors or props to let player distinguish which part of the map he/she currently is on.

Anyway, to end on a high note, the mages look very cute and nice, although with added animations they would look even better.
The most important thing is that the game, while seems really unfinished, was put out there to be judged with takes courage to do so.

Hope you'll find it helpful in some way, don't get discouraged, stay motivated and keep up trying in game jams :)