I think /f and /t could be a little bit wider to get the same openness as in the other letters. I think I would make the spine of /s a bit less diagonal. That's all the feedback I can give. I like the typeface a lot.
This is my new typeface Turbine. It will be part of the fontfont family soon but I think it is still a lot of work to do. The idea is quite simple: A squarish grotesk with open apertures. I would be very happy to get some comments and suggestions.







I think the second /s is clearly better as it follows the squared shape of the other letters more clearly. I also think it's more aesthetic on its own, though that's probably a secondary consideration.