I forgot that a new version has already been released, but since I'm testing 0.4.1, I haven't been able to fully master the game yet (I accidentally wrote 2 useful bug reviews here - https://beepbopdubi.itch.io/learntheheart/devlog/895962/devlog-ea-1).
Here are some more ideas: you can add weather effects during walks and dates (like rain), add much more sensual sex-poses to the game, which there are few so far (for example, pronebone for every girls) - as there is no even interaction with many items/beds in the basement (variety samples below):
With a mermaid on a boat, you can make another joke: clean the tail with a knife from fish scales to get to the legs and the cherished vagina))
More interaction with the girl (sudden kisses on her initiative, for example, after all successful dates during walks), the possible risk of pregnancy for each of the girls and subsequent responsibility for the child (for this reason, introduce a system of menstruation and contraceptive methods such as condoms, diaphragms, IUD's, spermicides, pill ...) - although I doubt about the latter, how will it look in the game, and is it worth it?
More mini-games, for example, playing checkers with a girl at home, rock-paper-scissors (Shifumi), poker/blackjack, some arcade platformers similar like Mario. Inviting a girl to your home, let her learn how to cook in the kitchen (food generation), also to dance (not only on a pole, striptease and everything else), together sit down to watch TV and take a bath. Expand the basement and have more space where to put furniture (everything doesn't fit). Make more opportunities for earning money (for example, as a construction worker, not just in a store and fishing). Make the gray dialog box more transparent so that it does not overlap a lot of graphics in the game. It is worth removing the control as on Android in the PC version of the game (it is more convenient to move the character with arrows and WASD by default).
Some more graphics flaws (more likely drawning errors) - Sylvia at desk in the basement looks like she's wearing black pants, although in fact she's wearing a skirt on her bare legs. Sylvia in Bathroom on Pos2 dissapear sound. Caitlyn has a slit cunt in a public toilet on a date (where there is an Arcade) that is somehow not drawn at the bottom, although the x-ray seems to show the vagina correctly as everywhere else. On a level in the forest, the character is superimposed "on top of the house":
