Dating sims aren't my usual thing, also, since it's a beta, only 4 stars. arrow0ash and kojeen-san mentioned a lot of things I agreed with.
Pros:
-Music available was good for such a game
-the concept for "battles" was great (NO I MESSED UP THE DATE!!! I'MMA GONNA DIE!!! of embarassment...)
-there was funny dialogue at some parts
-money was easy to get, but the expensive quest items should cost more (not regular items)
-the character art was great (ATTENTION! PERVERT ALERT! WATCH OUT! DON'T LET YOUR GF SEE YOU PLAY THIS GAME!!! ESPECIALLY IF SHE'S AN OVERLY GOOD CHRISTIAN GIRL!)
-no antagonist
Cons:
-very direct characterization in dialogue
-no antagonist
-no real reason for sleeping (that I noticed)
-not much music (but it's a beta so it doesn't really matter here)
-no storyline (or side plots)
Suggestions (besides the stuff I already wrote):
-Add events to the adventure in park. It could use random events (LOOK! IT'S A HOMELESS GUY HUMPING A REAL LIFE COWGIRL ie furry but it shouldn't be something that ridiculous) and relationship advancing talks with romantic interests ("Oh! You like this shop too, Pico?
-A way to offend the girls and lose approval (I never failed a date, but make dates tougher)
-A meaning behind the days passing like a 100 day time limit till something happens (insert story)
-A story that doesn't even really make much sense like, PICO IS GONNA DIE IF HE DOESN'T LOSE HIS VIRGINITY WITHIN 100 DAYS!!!
-Different ways to develop skills
-regular battles
That's it off the top of my head.