My suggestion is similar to DerKO. I would suggest taking inspiration from the Creeper World 2 leaderboard layout where individual levels have an RTA and IGT categories. There are very different strategies that you have to use for IGT categories and RTA runs. Just using one over the other will cause us to miss out on a lot of cool and different strategies when you have to make decisions on the fly or finding calculated and precise strategies while paused. Since the two games are very similar in their layout and time keeping, my vote would be to align this game's categories similar to that game. I know I am a bit biased having already done speed runs for Creeper World 2, so please take my suggestions with a grain of salt.

Nice job! I can definitely learn a thing or two from you. I think sub 1 hour is totally possible!