Well, the best way is to go to speedrun.com and search for the game. Those mad lads have beaten it in under1:30! The best that I can say is A. die as little as possible. B. obviously don't get berries. C. try to plan your route so you don't have to think about where to go next. Check speedrun.com because there is at least one glitch that saves probably 5 seconds. That is my best advice. I might post a speedrun to show off some of the tricks. And a big one is reset if you don't get to the first red orb without deaths.
Good job both of you! The speedrunning Discord server also has many of the strats documented and explained.