I just like the twist and the concept that you want to shield the world on the backside.
I believe that your sprites will look higher (particularly greater ones) for those who commit to 1 supply mild level. It is best to maintain it on the high, particularly since you have already got shadows on the backside. This needs to be utilized to buildings as effectively.
Including some shadows below the characters (in the identical method as you will have accomplished with bosses) will make them extra grounded visually.
Additionally, darkish textual content in your fundamental menu shouldn’t be very readable towards darker grey, despite the fact that you will have these brighter outlines. It is price that you simply experiment additional with that.
This is a quick edit with some ideas associated to the above mild supply place remark (I did not wish to change the designs simply, simply give ideas). I hope it will likely be useful.