An old school look and an old school difficulty.
I somehow died instantly after getting the jump? Maybe the timer was running in the dialogue screen that told me I obtained the jump.
Viewing post in Cavern Rush jam comments
Do you know if your timer was particularly low when you unlocked the ability? I think level 5 had the lowest base time to clear at like 0.5 to force players to interact with the main mechanic, but if memory serves I ceiling the time remaining before adding the next levels' time so at worst you should still have 1.5 seconds, but I'll look into it