The masala was not at all spicy, taking into account my kid's level of spice (even ours is very less!) Add in some chilli flakes while cooking the masala.
You can add a small capsicum, chopped into the masala while cooking.
For the salad, you can use many more vegetables other than cucumber and carrot, like onion, corn, etc. and add more flavoring elements, like pepper, chaat masala, amchur powder, etc.
You can roll out and use plain chapathis for the wrap.