The following link leads to pictures showing the maps of the different floors, showing where enemies start and where power ups are at. You can use this to help to come up with strategies for clearing levels faster.

https://docs.google.com/document/d/1HG3UOF0_2Ix_MNoKidnyXITFqE6u-afDJCFHR18S-QM/edit?usp=sharing