Speedrun
The public game page lists a speedrun timer toggle. The v0.04 devlog added a timer “for the speedrunners” with platform-specific notes below — all quoted from public store text.
Controls (official)
Source: Explosive Monday — official game page.
Tab(keyboard) /B(gamepad): hide speedrun timer.
Web vs download (official devlog)
Source: Update v0.04 — “Added a timer for the speedrunners” with this note:
“Not working on web because it does not support save system”
For timer behaviour on web vs desktop, rely on the quoted devlog line and the build you’re running — details can change between versions.
Further notes
The comments on the game page may have more developer replies about saves and the web build — read there for full threads and verbatim quotes.