Sometimes in level 5 to 7 it may be impossible. arrow keys to move this is to help for the bomb attack that chapter 5 deltarune superboss does space for next costume getting it resets your score
tip - when big bomb comes go into a corner level 1: for lazy people level 2 to 3 (maybe 4) for beginners level 4 is probably average level level 5 and 6 is for if you're actually doing mew mew level 7: nobody would do this. it's impossible! hearts: reach them to get score (you can disable them in the menu)