I am really glad you enjoyed the game! Thanks a lot for the kind words ^^
When it comes to more EXP gems the answer is simple, don’t kill the pesky summoners, they are a great source of EXP gems :p
There is a final Boss that spawns after ~9 minutes since last death (the timer gets shorter if you kill every enemy before the next wave would naturally spawn) If you beat him, you win, if you don’t - game over.
Was thinking about the progress indicators. Initially decided against them cause I thought players might get frustrated seeing them reset with the wielder’s death, which is something I wanted to avoid at all cost. But seems like giving more explanation to the player beforehand would be a good idea