Nefastium cells aren't working properly. If I put a tier 1 nefastium cell (51.871B heat) between two vents (30.284 heat each), their combined venting of ~60.5B heat venting SHOULD handle the cell. However, only one vent takes the heat and rapidly explodes.
Balance the rare items in the shop so anyone can afford them without buying crystals. Fix the challenge reward bug. Then I'll believe you're not trolling for money.
Now you should set a high score ;)