So:
Very interresting map, I really think this can become even a new gender (I thought of something similar to "impossibles boss", it was molten core if I remember well)
Although I dont think the heros are balanced. When you see the summoner, he can summon an imba tank. I didn't really check if each ability deals the right amount of damages tho.
The heros selection is a bit difficult. you should organize them like: tank/dps/support because the selection is a bit messy. maybe add colors to the texts and describe them in a shorter way like:
"hero name" === Tank/dps ==
This heros shows great defensive skills but can also become agressive when it's time.
Abilities: -blablabla
-blablabla
-blablabla
- Also set the spells level of all your heros to 1, 2, or 3 at the beginning of the game. Some heros already have spells on, some don't, and you don't have time to read everything because the boss arrives immediately after you pick.
-there is a little bug I think, on the top right corner of the map, something is under attack and the audio message : " under attack" is quite annoying when you select.
- it would be good to have a better visibility of the arena.
- I picked normal difficulty and the first boss but couldn't kill it, the visibility makes it really difficult when it's about "hit and run"
- The guardian makina can solo the first boss. But the first boss can also one shot some heros.
So to resume, I really think this map has a great potential but then there is a lot to change. Balancing heros, changing the arena visibility, give more time to prepare (its called strategy right ? ^^), Explain what are the boss so you can actually pick the right team.
Keep it up the idea is good !