Good work, very fast, simple, and the workflow is clear, and there are no ads. Could use some tweaks here and there kama wengine walivyosema hapo juu like mobile payments, digital tickets etc but all products evolve with time so I have no doubt you have those in your timeline.
What has not been mentioned yet is the branding, I think it's brilliant how simple it is but you may need a logo eventually. I think apps have conditioned us to that.
Lastly any product is as good as the users, market it, get it to users and bus operators, show them what they will gain etc. Resistance will be there because someone is playing middleman and is making money from it, if no one is using it is as good as dead. I really would love to see some something like this corner the market and make online booking a new normal.
Solid A+ from me. Godspeed.