Thank for the feedback!
I tested it on 480x320 resolution and it indeed looked horrible. I added MipMap filter to the texture which makes the text look a bit smother.. but i can't really say if its more readable. I never had smaller resolutions in mind mainly because i thought that game itself would perform poorly on these devices as there are at times thousands of box2d bodies flowing around. Anyway the update includes a MipMap filter so check it out and maybe let me know if it helped?
Thanks so much for finding that bug! Its fixed now. Regarding the sensibility the margin for error is already pretty big (in local coordinates) however theres one trick that probably no one notices is that you can zoom in and pan with two fingers. I added one line in tutorial that explains it now. Does zooming help or you thing something else should be done?
Thanks again for the feedback guys! I already uploaded a new version to google play so it should be live in a few hours.