I must say Dukaan is awesome platform and the rate at which they release features are so good.

Able to set up shop for one of my clients in a very short time compared to woocommerce.

It lacks theme customization now, but the available themes are good and helps a shop to go online in a quick way.

If they consider below features it will become ice on the cake:
-> In-store pickup (exclude delivery fee)
-> Discount by percent/amount in manual order like Point of Sale have so that billing person can provide discount for walkin customers.
(or atleast coupon code which can be used only in manual order screen - restriction in coupon functionality config)
-> Manual Payments (showing upi/bank account details - helpful for those having issue with payment gateway)
-> Barcode scanning in manual orders
-> Generate APK with custom icons/splash screen (without contacting support)
-> Webhooks - New order creation
-> Push Notification to Android app installed customers
-> Modular Themes

Am giving 5 tacos because the app is awesome to build eCommerce site and hope more features they will release in future to become a real shopify alternative.