It happened a few times to some things I tried to hold in my wallet, does the RAZOR feel sturdy enough to handle a little unintentional bending pressure?
It feels surprisingly sturdy considering its thickness. You shouldn't need to worry about putting the device in your wallet.
How does the app compare to something like Electrum in terms of more advanced functionality - having manual control over which UTXOs to spend from, sending to many, freezing coins/addresses, etc?
The only features I could find are: pay to many, spending only confirmed coins, labeling and adding OP_RETURN. No advanced coin control.