Fun little game despite lacking in H scenes but I pushed through and finished it all.
I would suggest to focus all your attention on the shop girl and only fish to fill up her love/like meter and only pursue her route while also semi focusing the pink hair girl just to unlock the bug net.
Once you finish your first play through with the shop girl then you can focus on making money by selling your bugs and fish so you can buy stuff at the shop much easier. The hidden pond where you meet the pink hair girl has a chance at 600$ sharks and I'm not sure at what point you can enter this area but eventually you can go north of your house and there will be a forest area (before the graveyard) with a bridge that lets you fish, if you go at night and keep going and in out of that area then you have a chance to spawn a gold mantis that sells for 600g, I easily get 2 a night and sometimes 3 before i get bored of spamming. Also right outside the main characters house at night theres a chance to catch a 2000$ snake but it takes a lot of spamming back and forth to spawn it.
I got stuck at some point and almost gave up, so talk to all the characters at least once. I was on my 3rd playthrough to finish the tutors route and eventually got stuck and turns out I had to just talk to the dad because I technically had never "met" him since I never clicked on him in the living room even though I had some scenes with him already.