Hey, I have a critique for you based on what I can see of the game. Take it for what it is (my opinion), and do with it as you see fit
Currently, I like the art a fair bit. And by that, I mean I think the art is charming, coherent, and serviceable. Pixel art, as a medium, is always a great choice when making games like these. It is easy to produce, and if experienced, fast to make. However, it does provide certain constraints, and in a lot of cases its best to follow these.
Based on the game tile art, your game apears to have a specific resolution that your art sticks to, but the title screen does not stick to this resolution. It has pixels that are smaller than the pixels in the tilemap. This is a way, makes me as the player ask, why the heck is the title screen in resolution A but the game in resolution B? When you create a pixel art game, part of it looking good comes down to style and skill, but another part of it comes down to consistency. Its like you are creating a world but when you break the rules of your world the player becomes less immersed in that world because it is no longer as believable. Does this make sense? In general, I believe pixel art should never have sub pixels unless it consistently has sub pixels in points of interests everywhere. In other words, if you break a "rule" break it in a way that makes sense in some form or fashion. Don't just break it arbitrarily at one point just because.
The title won't look better just because it is higher resolution. So in its case I would stick to a lower resolution. I would, also not draw it then morph the image, unless done carefully. Currently the title looks like something drawn in ms paint, rather than carefully pixel plotted. Now don't get me wrong, I am not saying it looks bad. It just looks different and is not consistent with the game. Because the title is one of the first things your player will look at, you need it to be a part of your game.
Does this all make sense. I don't mean to sound nit picky or anything, It is just an observation on my part. And it isn't something I would worry about until other higher priority tasks are complete, just something to keep in mind.