There is definitely a lot of effort put in this one. Long and pretty difficult at times.
That is of course quite irritating that you have to start whole level from the beginning, but overall this game is an enjoyable experience. Could use lots of polish though here and there, specifically design wise. but for a single developer this is a great game. Good luck.
P.S. it is not for left handed I guess, it is just you progress to the left instead of right, which is a bit confusing for sure ))).