OMORI

You fight Capt. Spaceb-, uh, Space Boyfriend, after fighting the Download Window boss and getting his Special Mixtape from the Junkyard. He's not particularly difficult, but you need a strategy.

First of all, make sure your party is at least Level 7, have Sparklers (they can be bought from the Mailbox Merchant) to make your party Happy (or use Aubrey's Pep Talk if you can't), have snacks that restore Heart and/or Juice such as a Banana Smoothie (restores 20 juice to everybody in your party) and preferably, Seer Goggles from putting 5 items in the Recycling Machine or Binoculars that can be found in the Junkyard.

The key to this fight is to make everyone Happy, since later in the fight, Space Ex-Boyfriend will become Angry, Enraged and eventually Furious. First of all, on the first turn, use Aubrey's Pep Talk on Kel, since he is the most vulnerable in the party, then on Omori, and then Aubrey and Hero. Kel should use Annoy on Space Ex-Boyfriend and after that, Omori should use Mock to reduce his Attack. After that, make sure one of your party members doesn't become Sad from Space Ex-Boyfriend's attack, and use Follow-Up attacks often.

After this fight, your Follow-up attacks will become better and deal more damage. You also get a Sno-Cone ticket, that increases a party member's stats and fully restores Heart and Juice. I recommend to save it for later during the harder boss fights, but you can just eat it when you get to Frozen Lake (also one Sno-Cone is 5000 clams so this is probably the only Sno-Cone you'll get).