I haven't actually tried the guide feature, but I'll try it. If you haven't already, I'd STRONGLY recommend that you play Stardew Valley so that Verdant Village doesn't look like a copy, and also so that you could get ideas from it. It has a really good harvesting mechanic I'd suggest using that's much better than Harvest Moon.
As for my PC, it's a fairly low-powered Widows 99. Just kidding, but it sometimes makes me feel like it was one. It's actually a Windows 8.1 laptop with 3.89 GB of RAM available, and a 64-bit OS, so that shouldn't be the issue. I've run programs like Stardew Valley and Roblox, and they both work pretty well. Don't worry, lag is a common issue, so maybe some folks don't notice it. It's also a game nerd thing, and since I'm very picky about how fast my games run so that's why I noticed it. The lag isn't so much of an issue as much of the camera issue. If you've played Stardew Valley, or more so Harvest Moon (I'm playing Tale of Two Towns), the camera is flawless. It moves smoothly. I think the issue with Verdant Village is the way the character moves affects the camera, but I'm not totally sure yet. The actual lag I've dealt with is minor, but if you release the game to the market, for people to like it it must work as well as the other farming-RPGs. Trust me, I watch and read stuff from IGN all the time, and they make the smallest bug into the biggest deal.
So maybe the fact that my PC is Windows 8.1 is the issue or something. It's really tough, but you just gotta optimize the game for all platforms, especially if you're going to eventually consider mobile and game consoles. Don't worry, even Stardew has it's issues, but the dev usually fixes them, so you should try to as well. Best of luck!
UPDATE (This is written later) I played the game again and it's still lagging pretty badly. It doesn't really lag in buildings, just outside. I'm going to try Stardew Valley since I haven't touched it in so long and see if that lags too, since maybe my PC is the issue.