Love the overall polish, the colour change was great idea and adds enough change to each run.
i felt there wasn't much choice out of the starting items; im almost forced to use the grapple as it offers mobilty which, in a time-based game around moving to things and killing them is kinda important and it, afaik, doesnt remove time unlike the gun. Perhaps making it consume time if you missed may improve things?
im presuming you did procedural gen for the map? if so props to you for that! The transitions between runs you added were great too and i loved the music! Overall great game well done!