When seeking help it's ALWAYS a good idea to include your Roku model, model number, and Roku software version (all available via Roku menu path Settings > System > About), as the advice you need may depend on this information.
You have presented several issues.
"SQUISHED" image via Roku app
There are two available apps from Roku for mobile devices. Which are you using?
The Roku App which is mainly an auxiliary remote control for use on mobile devices connected to the same local network as the Roku. This also permits viewing of The Roku Channel via the app via your Roku account.
The Roku Channel App which allows viewing the Roku Channel on your device independently of any Roku account but provides no remote control capabilities for your Roku.
In either case, if it is giving problems, see if deleting and reinstalling the app corrects the problem.
Controlling the Roku Stick via physical remote
Roku Streaming Stick models, if that's what you really have, (lots of people call other non-stick models as "sticks") are typically used behind the tv set where line of sight infrared (IR) remote controls like most universal remotes cannot reach. Consequently, Roku Streaming Stick models require point anywhere remotes that connect via wwifidirect and can't be controlled via IR universal remotes.
Roku stick for multiple tvs
Any Roku device has only a single output, to feed a single tv. If you want Roku on multiple tvs you'll need multiple Rokus.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X