Great fun! I genuinely love this concept, it gives me meat boy vibes and maybe mercenaries vibes with having to collect the time lol.
The only changes I'd make are making each level shorter so dying isn't as punishing, and making respawning and rescuing a survivor faster. It feel counterintuitive to have the game slow to a crawl when you wanna keep zooming through the levels.
If you ever expanded on this game I'd play it!