It's a very good start, and as someone working on something like this right now, it has a lot of potential.
Please don't upscale the sprites like you have here. Outside the trees, it doesn't look too good and very blurry. Having it internally render at a lower resolution for the better looking sprites to fit would be better. It's a great foundation for more stuff in the future and I am looking forward to what you do next with this. I wish you the most luck.