if you have 500 unused dna you'll get a strangth boost when pressing shift like the one you get from those fancy flowers. to get dna you should do the rainin lizards speedrun cause you get one dna for every lizard eaten. the instructions say that it also get easier when you do it on a higher difficult
if you are up to insane speedruns and the challenge the rainin lizards speedrun is very good for getting some dna to max out the stats and get the strength boost with shift